p-Dimethylaminoazobenzene
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This article is compiled based on the United States Pharmacopeia (USP) – 2025 Edition
Issued and maintained by the United States Pharmacopeial Convention (USP)
(Methyl Yellow, Butter Yellow), C6H5N:NC6H4N(CH3)2 225.29 CAS RN®: 60-11-7.-Yellow leaflets or yellow, crystalline powder.
1 Solubility
Insoluble in water; sparingly soluble in chloroform, in ether, or in fatty oils. Dissolve 100 mg in 20 mL of alcohol: the solution is complete or practically so and clear.
MELTING RANGE (741); between 115° and 117°.
RESIDUE ON IGNITION (281): not more than 0.1%.
2 Sensitiveness
Add 0.05 mL of an alcohol solution (1 in 200) and 2 g of ammonium chloride to 25 mL of carbon dioxide-free water: the lemon-yellow color of the solution is changed to orange by the addition of 0.05 mL of 0.1 N hydrochloric acid and restored on the subsequent addition of 0.05 mL of 0.1 N sodium hydroxide.
